Smoke in the tunnel and a passenger with chest pain
You are driving 14 passengers through a 3.5 km twin-bore tunnel with one lane in each direction. About 800 m in, you smell hot plastic and see thin grey smoke coming from behind the dashboard, and the alternator warning light comes on. At the same moment a 58-year-old male passenger behind you says he has crushing chest pain spreading to his left arm and jaw; he is pale and sweating. Traffic is moderate, the hard shoulder is 1.2 m wide, and emergency niches with fire extinguishers, an emergency telephone and an AED stand every 250 m. The exit is 2.7 km ahead. Your 2 kg dry-powder extinguisher is behind the driver's seat. Two passengers are already standing up to see what is happening.
1. Set out the order in which you act in the first 60 seconds and justify the order.
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Order: control the vehicle, protect the scene, evacuate, alarm, then treat.
Control: indicate right, slow progressively, and stop on the hard shoulder or, better, at the next emergency niche - do not stop in the driving lane, and do not try to reach the exit 2.7 km away with smoke in the cabin. Switch off the engine and put on hazard lights.
Protect: tell everyone to stay calm and stay seated for a moment while you assess whether there is flame. Put on the reflective vest.
Evacuate: get everyone out on the side away from the traffic and move them upwind, behind the barrier, to the nearest niche or emergency exit. Someone standing in a tunnel lane is the biggest immediate risk.
Alarm: use the emergency telephone in the niche - it identifies your exact position to the traffic control centre - or call 110. Say what is burning, how many passengers, and any injuries.
Treat: only when the group is safe do you deal with the patient. The order matters because a bus full of people in a live traffic lane in a tunnel is a bigger threat than any single medical case, and because you cannot do first aid and fire assessment at the same time.
2. What do you do for the man with chest pain, and how does the tunnel change your first-aid plan?
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Treat it as a suspected heart attack. Call 113 - or have the control centre relay through the emergency phone - and say clearly 'chest pain, conscious, sweating, 58 years old, tunnel at kilometre X'.
Have him sit down, half-sitting, leaning back against a wall or seat and not lying flat, since that eases the work of breathing. Loosen collar and belt, keep him warm with a blanket or jacket, and keep him still. Do not give food or drink. Ask whether he has nitroglycerin for angina and help him take his own medicine if he has it; aspirin only if the emergency operator advises it and he is not allergic. Stay with him, monitor breathing and consciousness, and be ready to start CPR and fetch the AED from the niche.
The tunnel changes the logistics, not the medicine. The ambulance has to come to you, so do not drive on and do not attempt to move him to the portal. Keep the rest of the group calm and out of the traffic, and send one named person to wait at the niche entrance to guide the crew in. If he becomes unresponsive and stops breathing normally, start compressions immediately, in the niche, whatever is happening with the vehicle.
3. You have a 2 kg dry-powder extinguisher. Under what circumstances do you use it, and what makes you abandon the attempt?
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Use it only on a small, contained fire that you can reach from outside the vehicle with a clear escape route behind you - for example a small flame under the bonnet or in a wheel arch. Approach from upwind and from the side, aim at the base of the flame, use short bursts, and keep the extinguisher between you and the fire only if that does not cut off your retreat.
A 2 kg dry-powder unit discharges in roughly 8-10 seconds. That single fact should govern the decision: it is enough to knock down a small fire or to buy time to get people out, and it is nothing against an established fire.
Abandon the attempt when the extinguisher is empty, when the fire re-ignites after being knocked down, when smoke builds or turns black and hot, when you feel heat through your clothing, or when the fire is near the fuel tank or the LPG/hybrid system. In all of those cases the extinguisher has done its job if it bought the evacuation; your only task then is to keep everyone upwind and away and let the fire service work. Never re-enter the vehicle for luggage or documents.